Question

我目前正致力于创建一个将连接多个表的视图。我可以通过使用左连接来获得结果，但查询加载速度非常慢。我也尝试过使用Inner Join，但没有显示任何结果。反正我的查询速度快吗？以下是代码：

CREATE 
ALGORITHM = UNDEFINED 
DEFINER = `root`@`%` 
SQL SECURITY DEFINER
VIEW `prc`.`vsrparts_latest` AS
SELECT 
    `prc`.`tbsrparts_new`.`SRPartsID` AS `SRPartsID`,
    `prc`.`tbsrparts_new`.`RepairID` AS `RepairID`,
    `prc`.`tbsrparts_new`.`SRNo` AS `SRNo`,
    `prc`.`tbsrparts_new`.`DateReceived` AS `DateReceived`,
    `prc`.`tbsrparts_new`.`ShipmentDate` AS `ShipmentDate`,
    `prc`.`tbparts`.`PartsNo` AS `PartsNo`,
    `prc`.`tbsrparts_new`.`PartID` AS `PartID`,
    `prc`.`tbparts`.`PartsDesc` AS `PartsDesc`,
    `prc`.`tbcompany`.`Company` AS `Company`,
    `prc`.`tbcompany`.`Alias` AS `Alias`,
    `prc`.`tbsrparts_new`.`RepairCenter` AS `RepairCenter`,
    `prc`.`tbsrparts_new`.`UserID` AS `UserID`,
    `prc`.`tbsrparts_new`.`NinetyDaysReturn` AS `NinetyDaysReturn`,
    `prc`.`tbsrparts_new`.`PartSN` AS `PartSN`,
    `prc`.`tbsrparts_new`.`RefurbishedSN` AS `RefurbishedSN`,
    `prc`.`tbsrparts_new`.`CountFrequency` AS `CountFrequency`,
    `prc`.`tbuser`.`EmployeeID` AS `EmployeeID`,
    `vpartsinfo`.`PartsNo` AS `FinalPart`,
    `prc`.`tbsrparts_new`.`FinalPart` AS `FinalPartID`,
    `prc`.`tbsrparts_new`.`EcoImplemented` AS `EcoImplemented`,
    `prc`.`tbsrparts_new`.`VisualInspectionStatus` AS `VisualInspectionStatus`,
    `prc`.`tbvisual`.`VisualInspectionErrorCode` AS `VisualInspectionErrorCode`,
    `prc`.`tbvisual`.`VisualInspectionActionTaken` AS `VisualInspectionActionTaken`,
    `prc`.`tbvisual`.`VisualInspectionComponentLocation` AS `VisualInspectionComponentLocation`,
    `prc`.`tbsrparts_new`.`VisualInspectionResult` AS `VisualInspectionResult`,
    `prc`.`tbsrparts_new`.`DebugTestingStatus` AS `DebugTestingStatus`,
    `prc`.`tb1stdebug`.`FirstDebugTestingErrorCode` AS `FirstDebugTestingErrorCode`,
    `prc`.`tb1stdebug`.`FirstDebugActionTaken` AS `FirstDebugActionTaken`,
    `prc`.`tb1stdebug`.`FirstDebugComponentLocation` AS `FirstDebugComponentLocation`,
    `prc`.`tb2nddebug`.`SecondDebugTestingErrorCode` AS `SecondDebugTestingErrorCode`,
    `prc`.`tb2nddebug`.`SecondDebugActionTaken` AS `SecondDebugActionTaken`,
    `prc`.`tb2nddebug`.`SecondDebugComponentLocation` AS `SecondDebugComponentLocation`,
    `prc`.`tb3rddebug`.`ThirdDebugTestingErrorCode` AS `ThirdDebugTestingErrorCode`,
    `prc`.`tb3rddebug`.`ThirdDebugActionTaken` AS `ThirdDebugActionTaken`,
    `prc`.`tb3rddebug`.`ThirdDebugComponentLocation` AS `ThirdDebugComponentLocation`,
    `prc`.`tbsrparts_new`.`DebugTestingResult` AS `DebugTestingResult`,
    `prc`.`tbsrparts_new`.`FctTestingStatus` AS `FctTestingStatus`,
    `prc`.`tb1stfct`.`FirstFctTestingErrorCode` AS `FirstFctTestingErrorCode`,
    `prc`.`tb1stfct`.`FirstFctActionTaken` AS `FirstFctActionTaken`,
    `prc`.`tb1stfct`.`FirstFctComponentLocation` AS `FirstFctComponentLocation`,
    `prc`.`tb2ndfct`.`SecondFctTestingErrorCode` AS `SecondFctTestingErrorCode`,
    `prc`.`tb2ndfct`.`SecondFctActionTaken` AS `SecondFctActionTaken`,
    `prc`.`tb2ndfct`.`SecondFctComponentLocation` AS `SecondFctComponentLocation`,
    `prc`.`tb3rdfct`.`ThirdFctTestingErrorCode` AS `ThirdFctTestingErrorCode`,
    `prc`.`tb3rdfct`.`ThirdFctActionTaken` AS `ThirdFctActionTaken`,
    `prc`.`tb3rdfct`.`ThirdFctComponentLocation` AS `ThirdFctComponentLocation`,
    `prc`.`tbsrparts_new`.`FctTestingResult` AS `FctTestingResult`,
    `prc`.`tbsrparts_new`.`RelayFailure` AS `RelayFailure`,
    `prc`.`tbsrparts_new`.`RelayDateCode` AS `RelayDateCode`,
    `prc`.`tbsrparts_new`.`DefectiveRelayColor` AS `DefectiveRelayColor`,
    `prc`.`tbsrparts_new`.`RelayFailureLocation` AS `RelayFailureLocation`,
    `prc`.`tbsrparts_new`.`DateCreated` AS `DateCreated`,
    `prc`.`tbsrparts_new`.`LastUpdated` AS `LastUpdated`,
    `prc`.`tbsrparts_new`.`EstimatedRepairCompletionDate` AS `EstimatedRepairCompletionDate`,
    `prc`.`tbsrparts_new`.`StartRepairDate` AS `StartRepairDate`,
    `prc`.`tbsrparts_new`.`Status` AS `Status`,
    `prc`.`tbsrparts_new`.`AttachmentName` AS `AttachmentName`,
    `prc`.`tbsrparts_new`.`PartsReturnProcess` AS `PartsReturnProcess`,
    (TO_DAYS(CURDATE()) - TO_DAYS(STR_TO_DATE(REPLACE(`prc`.`tbsrparts_new`.`DateReceived`,
                        ',',
                        '-'),
                    '%d-%M-%Y'))) AS `dateNew`
FROM
    (((((((((((`prc`.`tbsrparts_new`
    JOIN `prc`.`tbparts` ON ((`prc`.`tbsrparts_new`.`PartID` = `prc`.`tbparts`.`PartsID`)))
    JOIN `prc`.`tbcompany` ON ((`prc`.`tbsrparts_new`.`RepairCenter` = `prc`.`tbcompany`.`CompanyID`)))
    JOIN `prc`.`vpartsinfo` ON ((`vpartsinfo`.`PartsID` = `prc`.`tbsrparts_new`.`FinalPart`)))
    JOIN `prc`.`tbuser` ON ((`prc`.`tbsrparts_new`.`UserID` = `prc`.`tbuser`.`UserID`)))
    LEFT JOIN `prc`.`tbvisual` ON ((`prc`.`tbsrparts_new`.`RepairID` = `prc`.`tbvisual`.`RepairID`)))
    LEFT JOIN `prc`.`tb1stdebug` ON ((`prc`.`tbsrparts_new`.`RepairID` = `prc`.`tb1stdebug`.`RepairID`)))
    LEFT JOIN `prc`.`tb2nddebug` ON ((`prc`.`tbsrparts_new`.`RepairID` = `prc`.`tb2nddebug`.`RepairID`)))
    LEFT JOIN `prc`.`tb3rddebug` ON ((`prc`.`tbsrparts_new`.`RepairID` = `prc`.`tb3rddebug`.`RepairID`)))
    LEFT JOIN `prc`.`tb1stfct` ON ((`prc`.`tbsrparts_new`.`RepairID` = `prc`.`tb1stfct`.`RepairID`)))
    LEFT JOIN `prc`.`tb2ndfct` ON ((`prc`.`tbsrparts_new`.`RepairID` = `prc`.`tb2ndfct`.`RepairID`)))
    LEFT JOIN `prc`.`tb3rdfct` ON ((`prc`.`tbsrparts_new`.`RepairID` = `prc`.`tb3rdfct`.`RepairID`)))
ORDER BY `prc`.`tbsrparts_new`.`SRPartsID` DESC

以下是表格的架构：

的 tbsrparts_new

+-------------------------------+--------------------+------+-----+---------+----------------+
|             Field             |        Type        | Null | Key | Default |     Extra      |
+-------------------------------+--------------------+------+-----+---------+----------------+
| SRPartsID                     | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| RepairID                      | varchar(200)       | NO   |     | NULL    |                |
| SRNo                          | varchar(200)       | YES  | MUL | NULL    |                |
| DateReceived                  | varchar(200)       | YES  |     | NULL    |                |
| ShipmentDate                  | varchar(200)       | YES  |     | NULL    |                |
| NinetyDaysReturn              | varchar(200)       | YES  |     | NULL    |                |
| PartID                        | varchar(200)       | YES  |     | NULL    |                |
| PartSN                        | varchar(200)       | YES  |     | NULL    |                |
| RefurbishedSN                 | varchar(200)       | YES  |     | NULL    |                |
| FinalPart                     | varchar(200)       | YES  |     | NULL    |                |
| DefectPart                    | varchar(200)       | YES  |     | NULL    |                |
| RelayFailure                  | varchar(200)       | YES  |     | NULL    |                |
| RelayDateCode                 | varchar(200)       | YES  |     | NULL    |                |
| DefectiveRelayColor           | varchar(200)       | YES  |     | NULL    |                |
| RelayFailureLocation          | varchar(200)       | YES  |     | NULL    |                |
| RepairCenter                  | varchar(200)       | YES  |     | NULL    |                |
| UserID                        | varchar(200)       | YES  |     | NULL    |                |
| DateCreated                   | varchar(45)        | YES  |     | NULL    |                |
| LastUpdated                   | varchar(45)        | YES  |     | NULL    |                |
| LastUpdatedBy                 | varchar(45)        | YES  |     | NULL    |                |
| EstimatedRepairCompletionDate | varchar(45)        | YES  |     | NULL    |                |
| StartRepairDate               | varchar(45)        | YES  |     | NULL    |                |
| Attachment                    | longblob           | YES  |     | NULL    |                |
| AttachmentName                | varchar(45)        | YES  |     | NULL    |                |
| AttachmentType                | varchar(45)        | YES  |     | NULL    |                |
| AttachmentSize                | varchar(45)        | YES  |     | NULL    |                |
| PartsReturnProcess            | varchar(45)        | YES  |     | NULL    |                |
| EcoImplemented                | varchar(45)        | YES  |     | NULL    |                |
| CountFrequency                | varchar(45)        | YES  |     | NULL    |                |
| VisualInspectionStatus        | varchar(200)       | YES  |     | NULL    |                |
| VisualInspectionResult        | varchar(200)       | YES  |     | NULL    |                |
| DebugTestingStatus            | varchar(200)       | YES  |     | NULL    |                |
| DebugTestingResult            | varchar(200)       | YES  |     | NULL    |                |
| ICTTestingStatus              | varchar(200)       | YES  |     | NULL    |                |
| ICTTestingResult              | varchar(200)       | YES  |     | NULL    |                |
| ICTTestingErrorCode           | varchar(200)       | YES  |     | NULL    |                |
| ICTTestingActionTaken         | varchar(200)       | YES  |     | NULL    |                |
| ICTTestingComponentLocation   | varchar(200)       | YES  |     | NULL    |                |
| ICTTestingDesignator          | varchar(200)       | YES  |     | NULL    |                |
| FctTestingStatus              | varchar(200)       | YES  |     | NULL    |                |
| FctTestingResult              | varchar(200)       | YES  |     | NULL    |                |
| Status                        | varchar(40)        | YES  |     | NULL    |                |
+-------------------------------+--------------------+------+-----+---------+----------------+

的 tbuser

+---------------+--------------------+------+-----+---------+----------------+
|     Field     |        Type        | Null | Key | Default |     Extra      |
+---------------+--------------------+------+-----+---------+----------------+
| UserID        | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| Username      | varchar(500)       | YES  |     | NULL    |                |
| Password      | varchar(500)       | YES  |     | NULL    |                |
| Name          | varchar(500)       | YES  |     | NULL    |                |
| EmployeeID    | varchar(500)       | YES  | MUL | NULL    |                |
| Email         | varchar(500)       | YES  |     | NULL    |                |
| StatusID      | "int(10) unsigned" | YES  |     | NULL    |                |
| AuthorityID   | "int(10) unsigned" | YES  |     | NULL    |                |
| CompanyID     | "int(10) unsigned" | YES  |     | NULL    |                |
| LastUpdated   | varchar(50)        | YES  |     | NULL    |                |
| LastUpdatedBy | varchar(45)        | YES  |     | NULL    |                |
| LastLogin     | varchar(45)        | YES  |     | N/A     |                |
+---------------+--------------------+------+-----+---------+----------------+

的 tbparts

+-----------------+--------------------+------+-----+---------+----------------+
|      Field      |        Type        | Null | Key | Default |     Extra      |
+-----------------+--------------------+------+-----+---------+----------------+
| PartsID         | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| PartsNo         | varchar(20)        | NO   | MUL | NULL    |                |
| PartsDesc       | varchar(100)       | YES  |     | NULL    |                |
| CompanyID       | "int(10) unsigned" | NO   |     | NULL    |                |
| UserID          | "int(10) unsigned" | YES  |     | NULL    |                |
| LastUpdatedTime | varchar(45)        | YES  |     | NULL    |                |
| Category        | varchar(45)        | YES  |     | NULL    |                |
+-----------------+--------------------+------+-----+---------+----------------+

的 tbcompany

+--------------+--------------------+------+-----+---------+----------------+
|    Field     |        Type        | Null | Key | Default |     Extra      |
+--------------+--------------------+------+-----+---------+----------------+
| CompanyID    | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| Company      | varchar(45)        | NO   | MUL | NULL    |                |
| Alias        | varchar(45)        | YES  |     | NULL    |                |
| SupplierCode | varchar(45)        | NO   |     | NULL    |                |
+--------------+--------------------+------+-----+---------+----------------+

的 vpartsinfo

+-----------------+--------------------+------+-----+---------+-------+
|      Field      |        Type        | Null | Key | Default | Extra |
+-----------------+--------------------+------+-----+---------+-------+
| PartsID         | "int(10) unsigned" | NO   |     | 0       |       |
| PartsNo         | varchar(20)        | NO   |     | NULL    |       |
| PartsDesc       | varchar(100)       | YES  |     | NULL    |       |
| CompanyID       | "int(10) unsigned" | NO   |     | NULL    |       |
| UserID          | "int(10) unsigned" | YES  |     | NULL    |       |
| LastUpdatedTime | varchar(45)        | YES  |     | NULL    |       |
| Company         | varchar(45)        | NO   |     | NULL    |       |
| Name            | varchar(500)       | YES  |     | NULL    |       |
+-----------------+--------------------+------+-----+---------+-------+

的 tb1stdebug

+-----------------------------+--------------------+------+-----+---------+----------------+
|            Field            |        Type        | Null | Key | Default |     Extra      |
+-----------------------------+--------------------+------+-----+---------+----------------+
| FirstDebugID                | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| RepairID                    | varchar(500)       | YES  |     | NULL    |                |
| FirstDebugTestingErrorCode  | varchar(500)       | YES  | MUL | NULL    |                |
| FirstDebugActionTaken       | varchar(500)       | YES  |     | NULL    |                |
| FirstDebugComponentLocation | varchar(500)       | YES  |     | NULL    |                |
+-----------------------------+--------------------+------+-----+---------+----------------+

的 tb2nddebug

+-----------------------------+--------------------+------+-----+---------+----------------+
|            Field            |        Type        | Null | Key | Default |     Extra      |
+-----------------------------+--------------------+------+-----+---------+----------------+
| SecondDebugID                | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| RepairID                     | varchar(500)       | YES  |     | NULL    |                |
| SecondDebugTestingErrorCode  | varchar(500)       | YES  | MUL | NULL    |                |
| SecondDebugActionTaken       | varchar(500)       | YES  |     | NULL    |                |
| SecondDebugComponentLocation | varchar(500)       | YES  |     | NULL    |                |
+-----------------------------+--------------------+------+-----+---------+----------------+

的 tb3rddebug

+-----------------------------+--------------------+------+-----+---------+----------------+
|            Field            |        Type        | Null | Key | Default |     Extra      |
+-----------------------------+--------------------+------+-----+---------+----------------+
| ThirdDebugID                | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| RepairID                    | varchar(500)       | YES  |     | NULL    |                |
| ThirdDebugTestingErrorCode  | varchar(500)       | YES  | MUL | NULL    |                |
| ThirdDebugActionTaken       | varchar(500)       | YES  |     | NULL    |                |
| ThirdDebugComponentLocation | varchar(500)       | YES  |     | NULL    |                |
+-----------------------------+--------------------+------+-----+---------+----------------+

的 tb1stfct

+---------------------------+--------------------+------+-----+---------+----------------+
|           Field           |        Type        | Null | Key | Default |     Extra      |
+---------------------------+--------------------+------+-----+---------+----------------+
| FirstFctID                | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| RepairID                  | varchar(45)        | YES  |     | NULL    |                |
| FirstFctTestingErrorCode  | varchar(500)       | YES  | MUL | NULL    |                |
| FirstFctActionTaken       | varchar(500)       | YES  |     | NULL    |                |
| FirstFctComponentLocation | varchar(500)       | YES  |     | NULL    |                |
+---------------------------+--------------------+------+-----+---------+----------------+

的 tb2ndfct

+----------------------------+--------------------+------+-----+---------+----------------+
|           Field            |        Type        | Null | Key | Default |     Extra      |
+----------------------------+--------------------+------+-----+---------+----------------+
| SecondFctID                | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| RepairID                   | varchar(45)        | YES  |     | NULL    |                |
| SecondFctTestingErrorCode  | varchar(500)       | YES  | MUL | NULL    |                |
| SecondFctActionTaken       | varchar(500)       | YES  |     | NULL    |                |
| SecondFctComponentLocation | varchar(500)       | YES  |     | NULL    |                |
+----------------------------+--------------------+------+-----+---------+----------------+

的 tb3rdfct

+---------------------------+--------------------+------+-----+---------+----------------+
|           Field           |        Type        | Null | Key | Default |     Extra      |
+---------------------------+--------------------+------+-----+---------+----------------+
| ThirdFctID                | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| RepairID                  | varchar(45)        | YES  |     | NULL    |                |
| ThirdFctTestingErrorCode  | varchar(500)       | YES  | MUL | NULL    |                |
| ThirdFctActionTaken       | varchar(500)       | YES  |     | NULL    |                |
| ThirdFctComponentLocation | varchar(500)       | YES  |     | NULL    |                |
+---------------------------+--------------------+------+-----+---------+----------------+

的 tbvisual

+-----------------------------------+--------------------+------+-----+---------+----------------+
|               Field               |        Type        | Null | Key | Default |     Extra      |
+-----------------------------------+--------------------+------+-----+---------+----------------+
| VisualID                          | "int(10) unsigned" | NO   | PRI | NULL    | auto_increment |
| RepairID                          | varchar(45)        | YES  |     | NULL    |                |
| VisualInspectionErrorCode         | varchar(500)       | YES  | MUL | NULL    |                |
| VisualInspectionActionTaken       | varchar(500)       | YES  |     | NULL    |                |
| VisualInspectionComponentLocation | varchar(500)       | YES  |     | NULL    |                |
+-----------------------------------+--------------------+------+-----+---------+----------------+

Answer 1

（A）首先运行explain select [the whole select and join]并在某处保存输出。

（B）我计算了14个缺失的索引，我在下面的表格的Key列中表示为 MISS 。尽管表中有主键，但您正在进行表扫描而不使用索引。

在您的From子句中，您可以看到最右边的19条 NO 条评论。但实际上总有14个缺失

（C）考虑创建所有14个缺失的键（当然这会减慢插入速度）。

alter table tbsrparts_new add index(RepairID);
alter table tbsrparts_new add index(PartID);
alter table tbsrparts_new add index(FinalPart);
alter table tbsrparts_new add index(DefectPart);
alter table tbsrparts_new add index(RepairCenter);
alter table tbsrparts_new add index(UserID);
alter table vpartsinfo add index(PartsID);
alter table tb1stdebug add index(RepairID);
alter table tb2nddebug add index(RepairID);
alter table tb3rddebug add index(RepairID);
alter table tb1stfct add index(RepairID);
alter table tb2ndfct add index(RepairID);
alter table tb3rdfct add index(RepairID);
alter table tbvisual add index(RepairID);

（D）运行explain select [the whole select and join]并将输出保存在某处。

（E）将（A）和（D）的结果与问题分享，以便有人可以在您需要进一步帮助时为您提供帮助。

（F）开心时创建您的视图。

祝你好运！

SELECT 
    new.SRPartsID AS SRPartsID,
    new.RepairID AS RepairID,
    new.SRNo AS SRNo,
    new.DateReceived AS DateReceived,
    new.ShipmentDate AS ShipmentDate,
    tbparts.PartsNo AS PartsNo,
    new.PartID AS PartID,
    tbparts.PartsDesc AS PartsDesc,
    tbcompany.Company AS Company,
    tbcompany.Alias AS Alias,
    new.RepairCenter AS RepairCenter,
    new.UserID AS UserID,
    new.NinetyDaysReturn AS NinetyDaysReturn,
    new.PartSN AS PartSN,
    new.RefurbishedSN AS RefurbishedSN,
    new.CountFrequency AS CountFrequency,
    tbuser.EmployeeID AS EmployeeID,
    vpartsinfo.PartsNo AS FinalPart,
    new.FinalPart AS FinalPartID,
    new.EcoImplemented AS EcoImplemented,
    new.VisualInspectionStatus AS VisualInspectionStatus,
    tbvisual.VisualInspectionErrorCode AS VisualInspectionErrorCode,
    tbvisual.VisualInspectionActionTaken AS VisualInspectionActionTaken,
    tbvisual.VisualInspectionComponentLocation AS VisualInspectionComponentLocation,
    new.VisualInspectionResult AS VisualInspectionResult,
    new.DebugTestingStatus AS DebugTestingStatus,
    prc.tb1stdebug.FirstDebugTestingErrorCode AS FirstDebugTestingErrorCode,
    prc.tb1stdebug.FirstDebugActionTaken AS FirstDebugActionTaken,
    prc.tb1stdebug.FirstDebugComponentLocation AS FirstDebugComponentLocation,
    prc.tb2nddebug.SecondDebugTestingErrorCode AS SecondDebugTestingErrorCode,
    prc.tb2nddebug.SecondDebugActionTaken AS SecondDebugActionTaken,
    prc.tb2nddebug.SecondDebugComponentLocation AS SecondDebugComponentLocation,
    prc.tb3rddebug.ThirdDebugTestingErrorCode AS ThirdDebugTestingErrorCode,
    prc.tb3rddebug.ThirdDebugActionTaken AS ThirdDebugActionTaken,
    prc.tb3rddebug.ThirdDebugComponentLocation AS ThirdDebugComponentLocation,
    new.DebugTestingResult AS DebugTestingResult,
    new.FctTestingStatus AS FctTestingStatus,
    tb1stfct.FirstFctTestingErrorCode AS FirstFctTestingErrorCode,
    tb1stfct.FirstFctActionTaken AS FirstFctActionTaken,
    tb1stfct.FirstFctComponentLocation AS FirstFctComponentLocation,
    tb2ndfct.SecondFctTestingErrorCode AS SecondFctTestingErrorCode,
    tb2ndfct.SecondFctActionTaken AS SecondFctActionTaken,
    tb2ndfct.SecondFctComponentLocation AS SecondFctComponentLocation,
    tb3rdfct.ThirdFctTestingErrorCode AS ThirdFctTestingErrorCode,
    tb3rdfct.ThirdFctActionTaken AS ThirdFctActionTaken,
    tb3rdfct.ThirdFctComponentLocation AS ThirdFctComponentLocation,
    new.FctTestingResult AS FctTestingResult,
    new.RelayFailure AS RelayFailure,
    new.RelayDateCode AS RelayDateCode,
    new.DefectiveRelayColor AS DefectiveRelayColor,
    new.RelayFailureLocation AS RelayFailureLocation,
    new.DateCreated AS DateCreated,
    new.LastUpdated AS LastUpdated,
    new.EstimatedRepairCompletionDate AS EstimatedRepairCompletionDate,
    new.StartRepairDate AS StartRepairDate,
    new.Status AS Status,
    new.AttachmentName AS AttachmentName,
    new.PartsReturnProcess AS PartsReturnProcess,
    (TO_DAYS(CURDATE()) - TO_DAYS(STR_TO_DATE(REPLACE(new.DateReceived,
                        ',',
                        '-'),
                    '%d-%M-%Y'))) AS dateNew
FROM
    tbsrparts_new new
    JOIN tbparts ON tbsrparts_new.PartID=tbparts.PartsId    -- indexes there: **NO**, Yes
    JOIN tbcompany ON tbsrparts_new.RepairCenter = tbcompany.CompanyID -- indexes there: **NO** , Yes
    JOIN vpartsinfo ON vpartsinfo.PartsID = new.FinalPart -- indexes there: **NO**, **NO**

    JOIN tbuser ON new.UserID = tbuser.UserID -- indexes there: **NO**, Yes
    LEFT JOIN tbvisual ON new.RepairID = tbvisual.RepairID -- indexes there: **NO**, **NO**
    LEFT JOIN tb1stdebug ON new.RepairID = tb1stdebug.RepairID -- indexes there: **NO**, **NO**

    LEFT JOIN tb2nddebug ON new.RepairID = tb2nddebug.RepairID -- indexes there: **NO**, **NO**
    LEFT JOIN tb3rddebug ON new.RepairID = tb3rddebug.RepairID -- indexes there: **NO**, **NO**
    LEFT JOIN tb1stfct ON new.RepairID = tb1stfct.RepairID -- indexes there: **NO**, **NO**

    LEFT JOIN tb2ndfct ON new.RepairID = tb2ndfct.RepairID -- indexes there: **NO**, **NO**
    LEFT JOIN tb3rdfct ON new.RepairID = tb3rdfct.RepairID -- indexes there: **NO**, **NO**
ORDER BY new.SRPartsID DESC

以下是相关表格的架构。在答案开头注意我的评论（B）：

的 tbsrparts_new

连接多个表的Mysql视图导致查询速度慢

的 tbsrparts_new

的 tbuser

的 tbparts

的 tbcompany

的 vpartsinfo

的 tb1stdebug

的 tb2nddebug

的 tb3rddebug

的 tb1stfct

的 tb2ndfct

的 tb3rdfct

的 tbvisual

1 个答案:

的 tbsrparts_new

的 tbuser

的 tbparts

的 tbcompany

的 vpartsinfo

的 tb1stdebug

的 tb2nddebug

的 tb3rddebug

的 tb1stfct

的 tb2ndfct

的 tb3rdfct

的 tbvisual